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    Certificate TW12/11128



Trap  Filter


* Class A RFI Shielding

* Low Loss

* High Rejection

* Excellent Return Loss

* Flat Passband

* High Stability

* Excellent Mechanical Structure

* Precision Connector Thread

* Exquisite Plating Quality

* Good Weather Resistance

* Brass Housing
Trap Filters

A trap filter is used for filtering interference frequencies of Pay-Per-View(PPV) in CATV reception or other communication systems.

Soontai's TF series trap filters have many features (see below).

1. Very narrow notch window, affects nothing but the interference signal.

2. Lowest insertion loss, signal-through-loss reduced to a minimum.

3. High notch depth, provides excellent rejection capabilities to clear the interference signal.
    (Fig. 1)

4. Excellent return loss, good impedance match reduces signal loss to keep the
    signal clean. (Fig. 2)

5. Dual layer copper tubes provide the best radio frequency interference (RFI) / electromagnetic
    interference(EMI) protection.

The table below shows popular model of TF trap filter series. You may specify other models and notch frequencies according to your needs.

The trap filters have Negative, Positive and Signal notch types. Please see the filter profile technical notes in our Tech Support.

Custom filters or more details on inquires, please refer to Custom Filters.

  Items (PTF series, USA & TAIWAN CATV Channle)
Model Notch Frequency Model Notch Frequency
CH-2 57.5 MHz CH-21 165.5 MHz
CH-3 63.5 MHz CH-22 171.5 MHz
CH-4 69.5 MHz CH-23 219.5 MHz
CH-5 79.5 MHz CH-24 225.5 MHz
CH-6 85.5 MHz CH-25 231.5 MHz
CH-7 177.5 MHz CH-26 237.5 MHz
CH-8 183.5 MHz CH-27 243.5 MHz
CH-9 189.5 MHz CH-28 249.5 MHz
CH-10 195.5 MHz CH-29 255.5 MHz
CH-11 201.5 MHz CH-30 261.5 MHz
CH-12 207.5 MHz CH-31 267.5 MHz
CH-13 213.5 MHz CH-32 273.5 MHz
CH-14 123.5 MHz .  
CH-15 129.5 MHz .  
CH-16 135.5 MHz .  
CH-17 141.5 MHz to  
CH-18 147.5 MHz CH-86 597.5 MHz
CH-19 153.5 MHz CH-87 603.5 MHz
CH-20 159.5 MHz CH-88 609.5 MHz
  Electrical Curve ( CATV CH-5 )

This fig. shows the notch depth over 70dB.
Fig 1

Insertion Loss  |  Return Loss
Fig 2
  General Specifications
  Item PTF - CH5
  Impedance 75 ohm
  Frequency Range 5 - 750MHz
  Notch Frequency 79.5MHz
 Notch Depth 65dB (typ)
 Insertion Loss 0.6dB (typ)
 Video Loss(Picture carrier loss) 2.0dB (max)
 Audio Loss(Sound carrier loss) 2.0dB (max)
 Return Loss 14dB (typ)
 Power Passing (* selectable) DC +/-35V / 1Amp (max)
 Dimensions (incl. M/F connectors) 21(¢) x 74(L) mm
 Net Weight 55g
 * Specifications may be change depending on the model or customer's requirement.


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